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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AM3703CUS датащи(PDF) 188 Page - Texas Instruments |
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AM3703CUS датащи(HTML) 188 Page - Texas Instruments |
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188 / 280 page  A1 A1 A T OMAP AM3715, AM3703 SPRS616F – JUNE 2010 – REVISED AUGUST 2011 www.ti.com Table 6-19. LPDDR Signal Terminations NO. PARAMETER MIN TYP MAX UNIT NOTES 1 CK Net Class 0 10 Ω See Note(1) 2 ADDR_CTRL Net Class 0 22 Zo Ω See Notes(1),(2),(3) Data Byte Net Classes 3 0 22 Zo Ω See Notes(1),(2),(3) (DQS0-DQS3, DQ0-DQ3) (1) Only series termination is permitted, parallel or SST specifically disallowed. (2) Terminator values larger than typical only recommended to address EMI issues. (3) Termination value should be uniform across net class. 6.4.2.6 LPDDR CK and ADDR_CTRL Routing Figure 6-21 shows the topology of the routing for the CK and ADDR_CTRL net classes. The route is a balanced T as it is intended that the length of segments B and C be equal. In addition, the length of A should be maximized. Figure 6-21. CK and ADDR_CTRL Routing and Topology Table 6-20. CK and ADDR_CTRL Routing Specification (5) NO. PARAMETER MIN TYP MAX UNIT NOTES 1 Center to Center CK-CK spacing 2w 2 CK Differential Pair Skew Length Mismatch(4) 25 Mils See Note(1) 3 CK B to C Skew Length Mismatch 25 Mils Center to Center CK to other 4 4w See Note(2) LPDDR trace spacing 5 CK/ADDR_CTRL nominal trace length CACLM-50 CACLM CACLM+50 Mils See Note(3) 6 ADDR_CTRL to CK Skew Length Mismatch 100 Mils ADDR_CTRL to ADDR_CTRL 7 100 Mils Skew Length Mismatch Center to Center ADDR_CTRL to other 8 4w See Note(2) LPDDR trace spacing Center to Center ADDR_CTRL to other 9 3w See Note(2) ADDR_CTRL trace spacing ADDR_CTRL A to B, ADDR_CTRL A to C 10 100 Mils See Note(1) Skew Length Mismatch 11 ADDR_CTRL B to C Skew Length Mismatch 100 Mils (1) Series terminator, if used, should be located closest to AM37x. (2) Center to center spacing is allowed to fall to minimum (w) for up to 500 mils of routed length to accommodate BGA escape and routing congestion. (3) CACLM is the longest Manhattan distance of the CK and ADDR_CTRL net classes. (4) Differential impedance should be 100 ohms. (5) Specific routing guidelines for the CUS package can be found in the AM37x CUS Routing Guidelines (SPRABD4) application note. 188 Timing Requirements and Switching Characteristics Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): AM3715 AM3703 |
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